Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.